/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.giraph.graph;

/**
 * Simple immutable structure for storing a final vertex and edge count.
 */
public class VertexEdgeCount {
    /** Immutable vertices */
    private final long vertexCount;
    /** Immutable edges */
    private final long edgeCount;

    public VertexEdgeCount() {
        vertexCount = 0;
        edgeCount = 0;
    }

    public VertexEdgeCount(long vertexCount, long edgeCount) {
        this.vertexCount = vertexCount;
        this.edgeCount = edgeCount;
    }

    public long getVertexCount() {
        return vertexCount;
    }

    public long getEdgeCount() {
        return edgeCount;
    }

    public VertexEdgeCount incrVertexEdgeCount(
            VertexEdgeCount vertexEdgeCount) {
        return new VertexEdgeCount(
            vertexCount + vertexEdgeCount.getVertexCount(),
            edgeCount + vertexEdgeCount.getEdgeCount());
    }

    public VertexEdgeCount incrVertexEdgeCount(
            long vertexCount, long edgeCount) {
        return new VertexEdgeCount(
            this.vertexCount + vertexCount,
            this.edgeCount + edgeCount);
    }

    @Override
    public String toString() {
        return "(v=" + getVertexCount() + ", e=" + getEdgeCount() + ")";
    }
}
